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| (R) L9637D ISO 9141 INTERFACE OPERATING POWER SUPPLY VOLTAGE RANGE 4.5V VS 36V (40V FOR TRANSIENTS) REVERSE SUPPLY (BATTERY) PROTECTED DOWN TO VS -24V STANDBY MODE WITH VERY LOW CURRENT CONSUMPTION ISSB 1A @ VCC 0.5V LOW QUIESCENT CURRENT IN OFF CONDITION ISOFF = 120A TTL COMPATIBLE TX INPUT BIDIRECTIONAL K-I/O PIN WITH SUPPLY VOLTAGE DEPENDENT INPUT THRESHOLD OVERTEMPERATURE SHUT DOWN FUNCTION SELECTIVE TO K-I/O PIN WIDE INPUT AND OUTPUT VOLTAGE RANGE -24V VK VS K OUTPUT CURRENT LIMITATION, TYP IK = 60mA DEFINED OFF OUTPUT STATUS IN UNDERVOLTAGE CONDITION AND VS OR GND INTERRUPTION CONTROLLED OUTPUT SLOPE FOR LOW EMI HIGH INPUT IMPEDANCE FOR OPEN VS OR GND CONNECTION BLOCK DIAGRAM SO8 ORDERING NUMBER: L9637D DEFINED OUTPUT ON STATUS OF LO OR RX FOR OPEN LI OR K INPUTS DEFINED K OUTPUT OFF FOR TX INPUT OPEN INTEGRATED PULL UP RESISTORS FOR TX, RX AND LO EMI ROBUSTNESS OPTIMIZED DESCRIPTION The L9637D is a monolithic integrated circuit containing standard ISO 9141 compatible interface functions. VCC VS RTX RL O RRX K IK OFF + 1,75V TX + LI IL I RX + LO GND September 2002 1/10 L9637D ABSOLUTE MAXIMUM RATINGS (No damage or latch) Symbol VS VCC VS/dt VLI, K VLO, RX, TX Supply Voltage ISO transients t = 400ms Stabilized Voltage Supply Voltage transient Pin Voltage Pin Voltage Parameter Value -24 to +36 -24 to +40 -0.3 to +7 -10 to +10 -24 to VS -24 to VCC Unit V V V V/s V V Note: Max. ESD voltages are 2kV with human body model C = 100pF, R = 1.5k corresponds to maximum energy dissipation 0.2mJ according to MIL883C. PIN CONNECTION (Top view) RX 1 8 LI LO 2 7 VS VCC 3 6K TX 4 5 GND THERMAL DATA Symbol TJSDon TJSDoff Rth j-amb Parameter Temperature K shutdown switch on threshold Temperature K shutdown switch off threshold Thermal steady state junction to ambient resistance Min. 160 150 130 155 Typ. Max. 200 200 180 Unit C C C/W PIN DESCRIPTION N. 1 2 3 4 5 6 7 8 Name RX LO VCC TX GND K VS LI Output for K as input Output L comparator Stabilized voltage supply Input for K as output Common GND Bidirectional I/O Supply voltage Input L comparator Function 2/10 L9637D ELECTRICAL CHARACTERISTICS (The electrical characteristics are valid within the below defined operating conditions, unless otherwise specified. The function is guaranteed by design until TJSDon temperature shutdown switch-on-threshold.) Symbol VS VCC Tj ICC Parameter Supply Voltage Stabilized Voltage Junction temperature Supply VCC Current VCC 5.5V; VLI,VTX = 0V VK VKhigh; VLI VLIhigh VTX = VCC @ VCC 5.5V VS 16V; VLI, VTX = 0V VK VKhigh; VLI VLIhigh VTX VTXhigh @ VS 12V VCC 0.5V @ VS 12V Input Voltage Low state RX output status LOW 4.5V VS 18V RX output status LOW 18V < VS VKhigh Input Voltage High state RX output status HIGH 4.5V VS 18V RX output status HIGH 18V < VS VKhys IKoff Input Threshold Hysteresis Input Current VKhigh - VKlow @ VTX VTXhigh VK VS VS, VCC 0 VS, VCC = open @ VS 6.5V VTX VTXlow IK 7mA 1) 30 -24 2.5 VK VKlow; VLI VLIlow VS 6.5V IRX, LO 1mA 1) 9 10M RLRX 10M RLLO Output status = (HIGH) -0.15V VLO VCC + 0.15V -0.15V VRX VCC + 0.15V -0.15V VTX VCC + 0.15V LO output status LOW 4.5V VS 18V LO output status LOW 18V < VS LO output status HIGH 4.5V VS 18V LO output status HIGH 18V < VS VLIhigh - VLIlow or VLI VS VS, VCC 0 VS, VCC = open 40 20 -5 or 10 30 -24 -24 0.55VS 12 0.025 VS 4 -5 Test Condition Min. 4.5 3 -40 1.4 <1 1.2 120 <1 0.45VS 8 VS VS 0.8 25 Typ. Max. 36 7 150 2.3 5 3 220 Unit V V C mA A mA A A V V V V V A ISON ISOFF ISSB VKlow Supply VS Current RKON Output ON Impedance IKSC VTXlow VTXhigh RRXON RLOON IRXSC ILOSC VRXH VLOH RLO RRX RTX VLIlow Short Circuit Current Input voltage LOW state Input voltage HIGH state Output ON Impedance Output Short Circuit Current Output Voltage HIGH state 60 100 1 VCC 90 35 mA V V mA VCC 0.25 5 10 -24 -24 0.55VS 12 VCC 0.1 10 20 VCC V Output pull-up resistance 20 40 0.45VS 8 VS VS 0.8 25 K K V V V V V A Input pull up resistance Input voltage LOW state VLhigh Input voltage HIGH state VLIhys ILI Input threshold hysteresis Input current 0.025VS -5 4 3/10 L9637D ELECTRICAL CHARACTERISTIC (continued) Symbol CKi, LO, RX fLI-LO fK-RX fTX-k trLI-LO trK-RX trTX-K tfLI-LO tfK-RX tfTX-K tOFF,LI-LO tOFF,K-RX tOFF,TX-K tON,LI-LO tON,K-RX tON,TX-K Parameter Internal output capacities Transmission Frequency 9V < VS < 16V (external loads) RKO = 510, CK 1.3nF in active mode see Fig. 3 for the definition of tr, tf see Fig.1. 9V < VS < 16V (external loads) RKO = 510, CK 1.3nF for the definition of ton, tOFF see Fig.1. 9V < VS < 16V (external loads) RKO = 510, CK 1.3nF (inactive mode see Fig. 3) Test Condition Min. Typ. Max. 20 Unit pF 50 100 kHz Rise Time 2 6 s s s s Fall Time 2 6 Switch OFF time 4 17 Switch ON time 4 17 1) For output currents lower than this value a series protection diode can become active. See also Fig. 4 and 5. Figure 1: Input to Output Timings and Output Pulse Shape. VI t VOUT 80% 80% 20% 20% tr t OFF t ON tf t 4/10 L9637D Figure 2: ISO Application Circuit VS RTX RLO RRX VCC VS 40V R KO - 5V TX VCC I/O 510 Ohm K CK K + IK OFF 1,75V 0.4 Ohm Diagnostic Tester LI + RX I/O uP LO + I/O L ILI GND VDD ECU1 K Line L Line K CK LI ECU2 FUNCTIONAL DESCRIPTION The L9637D is a monolithic bus driver designed to provide bidirectional serial communication in automotive diagnostic applications according to the specification "Diagnostic Systems ISO9141". The device provides a bidirectional link, called K, to the VBat related diagnosis bus. It also includes a separate comparator L which is also able to be linked to the VBat bus. The input TX and output RX of K are related to VCC with her integrated pull up resistances. Also the L comparator output LO has a pull up resistance connected to VCC. The maximum external pull up resistance at K related to VS should not be higher than RKO 5K to achieve clear output ON conditions. All VBat bus defined inputs LI and K have supply voltage dependent thresholds together with suf- ficent hysteresis to suppress line spikes. These pins are protected against overvoltages, shorts to GND and VS and can also be driven beyond VS and GND. These features are also given for TX, RX and LI only taking into account the behaviour of the internal pull up resistances. The thermal shut down function switches OFF the K output if the chip temperature increases above the thermal shut down threshold. To reactivate K again the chip temperature must decrease below the K switch ON temp. To achieve no fault for VS undervoltage conditions the outputs will be switched OFF and stay at high impedance. The device is also protected against reverse battery condition. During lack of VS or GND all pins shows high impedance characteristic. To realize a lack of the VS related bus line LI and K the outputs LO and RX shows defined ON status. 5/10 L9637D Supressing all 4 classes of "Schaffner" signals all pins can be load with short energy pulses of max. 0.2mJ. All these features together with a high possible baud rate >50Kbaud, controlled output slopes for low EMI, a wide power supply voltage range and a very small quiescent current during OFF (TX LI K=High) condition ISoff typ 120A, and a real standby function with zero power consumption ISSB typ 1A during system depowering VCC 0.5V make this device high efficient for automotive bus system. After wake up of the system from OFF or SB condition the first output signal will have an additional delay time tdtyp 5s see also Fig. 3. The typical output voltage behaviour for the K, LO, RX outputs as a function of the output current is shown in Fig.4. Fig.5 shows a waveform of the output signal when the low level changes from RON * IOUT to IOUT * 2 * RON + UBE state. This variation occurs due to too low output current or after a negative transient forced to the output or to the supply voltage line. Figure 3: Typical timing for mode transitions. O FF a c ti v e O FF a c tiv e LI LO TX K RX td t ON LI - LO td t ON TX - K 6/10 L9637D Figure 4: Output Characteristics at K, LO, RX. IO UT IOU T M IN V OUT = IO U T * R D S O N R DSON p r o t e c tio n d i o d e V OUT = IO U T * 2 * R D S O N + U B E VO UT 0 .8 V Figure 5: Output Signal Shape Related to Output Current. V IN t VOUT IO U T * 2 * R D S O N + U B E IO U T * R D S O N IO U T > IO U T M IN IO U T > IO U T M IN I O U T < IO U T M IN t 7/10 L9637D Figure 6: EMS Performance (ISO 9141 BUS system). = V S = 1 2V 510 Ohm VS 50 Ohm TX IS O i n te rfa c e K 136 Ohm NAP - 73 S MG 1 0k H z 1 .5 n F P im a x = 5 W 0 .1 - 1 0 0 0 M H z P ro b e 4 0 dB R h o d e & S c h w a rtz 68 Ohm VS D Pi K RX IS O i n te rfa c e Signal comparison 10 D 10% % NAP Figure 7. P i(m W ) 10000 n o t i n c id e n t p o w e r re s i s ta n t 5000 1000 in c id e n t p o w e r r e s is t a n t 100 1 10 100 1000 f (M H z) 8/10 L9637D mm MIN. A a1 a2 a3 b b1 C c1 D (1) E e e3 F (1) L M S 3.8 0.4 4.8 5.8 1.27 3.81 4.0 1.27 0.6 8 (max.) 0.15 0.016 0.65 0.35 0.19 0.25 0.1 TYP. MAX. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 0.026 0.014 0.007 0.010 0.004 MIN. inch TYP. MAX. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 DIM. OUTLINE AND MECHANICAL DATA 45 (typ.) 5.0 6.2 0.189 0.228 0.050 0.150 0.157 0.050 0.024 0.197 0.244 SO8 (1) D and F do not include mold flash or protrusions. Mold flash or potrusions shall not exceed 0.15mm (.006inch). 9/10 L9637D Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c) 2002 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. http://www.st.com 10/10 |
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